HEIDENHAIN TNC 426B (280 472) ISO programming - Manual (Page 246)

8 Programming: Cycles 230
SCALING FACTOR (Cycle G72)
The TNC can increase or reduce the size of contours within a
program, enabling you to program shrinkage and oversize
allowances.
Effect
The SCALING FACTOR becomes effective as soon as it is defined in
the program. It is also effective in the Positioning with MDI mode of
operation. The active scaling factor is shown in the additional status
display.
The scaling factor can be applied
■ in the working plane, or on all three coordinate axes at the same
time (depending on machine parameter 7410)
■ to the dimensions in cycles
■ to the parallel axes U,V,W
Prerequisite
It is advisable to set the datum to an edge or a corner of the contour
before enlarging or reducing the contour.
ú Scaling factor ?: Enter the scaling factor F. The TNC
multiplies the coordinates and radii by the F factor (as
described under “Activation” above)
Enlargement: F greater than 1 (up to 99.999 999)
Reduction F less than 1 (down to 0.000 001)
Cancellation
Program the SCALING FACTOR cycle once again with a scaling
factor of 1.
Example NC block:
N72 G72 F0.980000*
8.9 Coor
dinat
e
T
ransf
or
mation Cy
cles
Z
Z
X
X
Y
Y
Kkap8.pm6 29.06.2006, 08:06 230